Question: Who is the PhD candidate for Niels Bohr?
Paraphrase: Who is the PhD candidate for Niels Bohr?
SPARQL (Wikidata):  select distinct ?sbj where { ?sbj wdt:P185 wd:Q7085 . ?sbj wdt:P31 wd:Q5 } 
Answer: Christian Christiansen, J. J. Thomson